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DIY Cheap Easy Solar Water Purification

DIY Cheap Easy Solar Water Purification

Do you need to disinfect a few batches of water to make them safe to drink?

You can do this easily by setting a few bottles of clear water out in the sun for the duration of the day (or over two days if it’s 1/2 cloudy).

This method, called SODIS (i.e. “SO-lar DIS-infection”), uses the sun’s UVA rays to effectively kill bacteria and viruses. One requirement is that the water in the bottle be clear enough to read through. If you’re starting with dirty water, you should strain it through a clean cloth and let it settle first.

(Note that this method won’t actually filter the water — it will simply kill pathogens. But there are easy ways to filter water, using a quick sand filter or, if you have a more permanent stationary installation, a biosand water filter.)

disinfection filter purification safe to drink sanitation water

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  • Dwayne Allen
    July 23, 2015

    Actually it is best to use glass. Plastic bottles give off toxins in the sun..

    • September 22, 2015

      Correct. Glass is best. That said, when I’m in a situation where my choice is between “immediate intestinal virus that could be fatal” and “dubious risk of microscopic carcinogen exposure that may affect me in 20 years”, I’m picking the former. 🙂 Large glass bottles are just not very handy to be carrying around in 35 sq ft of living space.

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